Asthenosfære

Liggende under litosfæren er asthenosfæren et lag av mest fast materiale (de smeltede områder af asthenosfæren findes f.eks. Nær Oceanrygge og subduktionszoner).

Den adskiller sig fra litosfæren i den måde, den reagerer på den påførte kraft – den deformeres plastisk (hvilket betyder, at materialet ikke genopretter sin oprindelige form efter fjernelse af den virkende kraft).

Bevægelsen af tektoniske plader skyldes at de litosfæriske plader “flyder” ovenpå asthenosfæren, som – i geologisk tidsplan – er imødekommende konvektiv bevægelse.

 

Illustration: leeds.ac.uk

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